Home / 1,518.20-2,274.90-786.68

Finding the Fourth Proportional to 1,518.20, 2,274.90 and 786.68

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Solution

The fourth proportional to 1,518.20, 2,274.90 and 786.68 is: 1,178.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,518.20 : 2,274.90 = 786.68 : x
  2. Step 2: Convert to fraction form
    1,518.20/2,274.90 = 786.68/x
  3. Step 3: Cross multiply
    1,518.20x = 2,274.90 × 786.68
  4. Step 4: Simplify right side
    1,518.20x = 1,789,618.33
  5. Step 5: Solve for x
    x = 1,789,618.33/1,518.20
  6. Step 6: Final answer
    x = 1,178.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.